The inhibition efficiency (IE) of the hydrochloride salt of chitosan biguanidine (CBG-HCl, a green organic compound) on stainless steel alloy (SS) corrosion in 0.5 M H2SO4 solution was documented in this work. Data reported for electrochemical impedance spectroscopy (EIS) and potentiodynamic analysis confirmed increasing of the corrosion resistance of stainless steel in 0.5 M H2SO4 solution in the presence of CBG-HCl with a synergistic effect of KI. Potentiodynamic experiments also indicate that the blend of CBG-HCl-KI works as a mixed-type inhibitor for stainless steel alloy corrosion. The best information gathered agreed with the Langmuir isotherm model. The corresponding normal Gibbs inhibitor adsorption free energy implied that the processes are random and involved two forms of interactions, chemisorption and physisorption. The highest inhibition efficiency (88 %) in this work was reported for 400 ppm of CBG-HCl blended with 800 ppm KI. In fact, with a long immersion time, the efficiency of CBG-HCl inhibition remains effectively high, demonstrating its good stability in the 0.5 M H2SO4 medium.
This work tested the ethanol extract of Camphor tree Cinnamomum camphora bark (CTBEE) as a green corrosion inhibitor of low carbon steel (LCS) in 0.5 M H2SO4 with and without the synergistic effect of 0.1 M NaCl or 800 ppm of KI. The corrosion protection of LCS was significantly increased in the presence of CTBEE-KI and CBWE-NaCl blends compared to CTBEE alone, according to data performed by electrochemical impedance spectroscopy (EIS) and electrochemical polarization (EP) analyses. The formation of a film by the blends blocks the LCS surface area preventing corrosive gradients to reach its surface. Inhibition efficiency (IE%) of 81 and 89% were obtained in the presence of 800 ppm CTBEE-0.1 M NaCl and CTBEE-800 ppm KI, respectively, compared to IE of 65% in the presence of 800 ppm CTBEE only. A maximum IE% of 89 and 97% were reached after 72 hours of immersion in the presence of CTBEE-NaCl and CTBEE-KI, respectively. Potentiodynamic experiments indicate that the blends act as mixed-type inhibitors. Inhibition efficiency of CTBEE, CTBEE-KI and CTBEE-NaCl remained effectively high with testing period of immersion time which proved the good stability of CTBEE in the corrosive acidic media.
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